Two membrane-bound enzyme systems are associated with
the insulin signal: the adenyl cyclase-cAMP and the
Magnesium - activated Sodium – Potassium - ATPase
systems. Insulin inhibits cAMP formation only in
situations where it has been previously stimulated by
catecholamines, glucagons, or other hormones.
Stimulation of intracellular Potassium transport is one
of the well-known effects of insulin